Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

Why do you find that most of the buildings are deprived of the 13th floor?

Which alphabet is a part of our body?

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

A newspaper is supposed to have 60 pages.Pages 14 and 21 are missing from the newspaper.

Can you tell me , Which other pages won't be there as well ?

Can you place three balls such that the equation shown in the picture holds true?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?